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MCQs

Total Questions : 448 | Page 44 of 45 pages
Question 431. . Joule sec is the unit of
  1.    Universal gas constant
  2.    Kinematic viscosity
  3.    Thermal conductivity
  4.    Planck's constant
 Discuss Question
Answer: Option D. -> Planck's constant
Question 432. . Log mean temperature difference in case of counter flow compared to parallel flow will be
  1.    Same
  2.    More
  3.    Less
  4.    Depends on other factors
 Discuss Question
Answer: Option B. -> More
Question 433. . The energy distribution of an ideal reflector at higher temperatures is largely in the range of
  1.    Shorter wavelength
  2.    Longer wavelength
  3.    Remains same at all wavelengths
  4.    Wavelength has nothing to do with it
 Discuss Question
Answer: Option A. -> Shorter wavelength
Question 434. . The thermal diffusivities for solids are generally
  1.    Less than those for gases
  2.    Jess than those for liquids
  3.    Inorg than those for liquids and gases
  4.    More or less same as for liquids and gases
 Discuss Question
Answer: Option C. -> Inorg than those for liquids and gases
Question 435. . Stefan Boltzmann law is applicable for heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and radiation combined
 Discuss Question
Answer: Option C. -> Radiation
Question 436. . Thermal diffusivity of a substance is
  1.    Directly proportional to thermal conductivity
  2.    Inversely proportional to density of substance
  3.    Inversely proportional to specific heat
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 437. . At thermal equilibrium
  1.    Absorptivity is greater than emissivity
  2.    Absorptivity is lesser than emissivity
  3.    Absorptivity is equal to emissivity
  4.    Sum of absorptivity and emissivity is unity
 Discuss Question
Answer: Option C. -> Absorptivity is equal to emissivity
Question 438. . According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
  1.    Absolute temperature
  2.    Square of temperature
  3.    Fourth power of absolute temperature
  4.    Fourth power of temperature
 Discuss Question
Answer: Option C. -> Fourth power of absolute temperature
Question 439. . Which of the following property of air does not increase with rise in temperature
  1.    Thermal conductivity
  2.    Thermal diffusivity
  3.    Density
  4.    Dynamic viscosity
 Discuss Question
Answer: Option C. -> Density
Question 440. . 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
  1.    0.45
  2.    0.55
  3.    0.40
  4.    0.75
 Discuss Question
Answer: Option A. -> 0.45

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